US10603436B2 - Auto-injector - Google Patents

Abstract

Auto-injector for administering a dose of a liquid medicament includes a housing to contain a syringe with a hollow needle and a stopper for sealing the syringe and displacing the medicament (M), the housing having a distal end (D) and a proximal end (P) with an orifice to apply against an injection site. A spring means, upon activation, can push the needle from inside the housing through the orifice and past the proximal end (P), operate the syringe to supply the dose of medicament (M), and retract the syringe with the needle after delivering the medicament (M). An activating means can lock the spring means in a pressurized state prior to manual operation and capable of, upon manual operation, releasing the spring means for injection.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. patent application Ser. No. 15/165,720, filed May 26, 2016, which is a continuation of U.S. patent application Ser. No. 13/806,324 filed Dec. 21, 2012, which is a U.S. National Phase Application pursuant to 35 U.S.C. § 371 of International Application No. PCT/EP2011/060726 filed Jun. 27, 2011, which claims priority to European Patent Application No. 10167506.4 filed Jun. 28, 2010. The entire disclosure contents of these applications are herewith incorporated by reference into the present application.

TECHNICAL FIELD

The invention relates to an auto-injector for administering a dose of a liquid medicament according to the preamble ofclaim1.

BACKGROUND

Administering an injection is a process which presents a number of risks and challenges for users and healthcare professionals, both mental and physical.

Injection devices (i.e. devices capable of delivering medicaments from a medication container) typically fall into two categories—manual devices and auto-injectors.

In a manual device—the user must provide the mechanical energy to drive the fluid through the needle. This is typically done by some form of button/plunger that has to be continuously pressed by the user during the injection. There are numerous disadvantages to the user from this approach. If the user stops pressing the button/plunger then the injection will also stop. This means that the user can deliver an underdose if the device is not used properly (i.e. the plunger is not fully pressed to its end position). Injection forces may be too high for the user, in particular if the patient is elderly or has dexterity problems.

The extension of the button/plunger may be too great. Thus it can be inconvenient for the user to reach a fully extended button. The combination of injection force and button extension can cause trembling/shaking of the hand which in turn increases discomfort as the inserted needle moves.

Auto-injector devices aim to make self-administration of injected therapies easier for patients. Current therapies delivered by means of self-administered injections include drugs for diabetes (both insulin and newer GLP-1 class drugs), migraine, hormone therapies, anticoagulants etc.

Auto-injectors are devices which completely or partially replace activities involved in parenteral drug delivery from standard syringes. These activities may include removal of a protective syringe cap, insertion of a needle into a patient's skin, injection of the medicament, removal of the needle, shielding of the needle and preventing reuse of the device. This overcomes many of the disadvantages of manual devices. Injection forces/button extension, hand-shaking and the likelihood of delivering an incomplete dose are reduced. Triggering may be performed by numerous means, for example a trigger button or the action of the needle reaching its injection depth. In some devices the energy to deliver the fluid is provided by a spring.

US 2002/0095120 A1 discloses an automatic injection device which automatically injects a pre-measured quantity of fluid medicine when a tension spring is released. The tension spring moves an ampoule and the injection needle from a storage position to a deployed position when it is released. The content of the ampoule is thereafter expelled by the tension spring forcing a piston forward inside the ampoule. After the fluid medicine has been injected, torsion stored in the tension spring is released and the injection needle is automatically retracted back to its original storage position.

The spring means is a single compression spring arranged to be grounded at a distal end in the housing for advancing the needle and for injecting the dose of medicament via a plunger and wherein the compression spring is arranged to have its ground in the housing switched to its proximal end for retracting the syringe.

SUMMARY

It is an object of the present invention to provide an improved auto-injector.

The object is achieved by an auto-injector according toclaim1.

Preferred embodiments of the invention are given in the dependent claims.

In the context of this specification the term proximal refers to the direction pointing towards the patient during an injection while the term distal refers to the opposite direction pointing away from the patient.

According to the invention, an auto-injector for administering a dose of a liquid medicament comprises:

• • an elongate housing arranged to contain a syringe with a hollow needle and a stopper for sealing the syringe and displacing the medicament, the housing having a distal end and a proximal end with an orifice intended to be applied against an injection site, wherein the syringe is slidably arranged with respect to the housing,
  • spring means capable of, upon activation:
  • pushing the needle from a covered position inside the housing into an advanced position through the orifice and past the proximal end,
  • operating the syringe to supply the dose of medicament, and
  • retracting the syringe with the needle into the covered position after delivering the medicament,
  • activating means arranged to lock the spring means in a pressurized state prior to manual operation and capable of, upon manual operation, releasing the spring means for injection.

According to the invention the spring means is a single drive spring in the shape of a compression spring arranged to be grounded at a distal end in the housing for advancing the needle and for injecting the dose of medicament. The force of the drive spring is forwarded to the needle and/or the syringe via a plunger. The drive spring is arranged to have its ground in the housing switched to its proximal end for retracting the syringe when the injection of the medicament is at least nearly finished.

The single drive spring is used for inserting the needle, fully emptying the syringe and retracting the syringe and needle to a safe position after injection. Thus a second spring for withdrawing the syringe and needle, which is a motion with an opposite sense compared to advancing the syringe and injecting the dose, is not required. While the distal end of the drive spring is grounded the proximal end moves the syringe forward for inserting the needle and carries on to the injection by pushing on the stopper. When the injection is at least nearly finished the drive spring bottoms out at its proximal end, resulting in the proximal end being grounded in the housing. At the same time the distal end of the drive spring is released from its ground in the housing. The drive spring is now pulling the syringe in the opposite direction.

According to the invention the activating means is arranged as a trigger button laterally arranged on the housing. A lateral trigger button can be easier to operate for people with dexterity problems.

The auto-injector according to the invention has a particularly low part count compared to most conventional auto-injectors. The use of just one drive spring reduces the amount of metal needed and thus consequently reduces weight and manufacturing costs.

The trigger button is preferably pivoted in the housing and arranged to be rotated when operated.

An interlock sleeve may be telescoped in the proximal end of the housing, the interlock sleeve translatable in longitudinal direction between a proximal position and a distal position and biased in proximal direction in a manner to protrude from the housing in the proximal position. The interlock sleeve is arranged to be translated from its proximal position into an intermediate position when pressed against the injection site. The trigger button is arranged to push the interlock sleeve from the intermediate position into the distal position thus releasing the drive spring. Before the syringe and needle translate in proximal direction the activating means, i.e. the lateral trigger button has to be operated so as to release the drive spring. The probability for inadvertent operation of the auto-injector thus decreases due to the requirement of two user actions, pressing the auto-injector against the injection site and operating the trigger button.

In its proximal position the interlock sleeve may be arranged to hold the trigger button in a depressed position, e.g. flush with the housing. Translation of the interlock sleeve into the intermediate position causes the trigger button to emerge from the housing into a ready position. This provides a sequenced operation in a manner that the trigger button cannot be operated before the interlock sleeve is pressed against the injection site.

It is desirable to trigger the retraction of the needle when the contents of the syringe have been entirely delivered to the patient, i.e. when the stopper has bottomed out in the syringe. Automatically triggering the retraction when the stopper exactly reaches the end of its travel is a problem due to tolerances when manufacturing the syringe and stopper. Due to these tolerances the position of the stopper at the end of its travel relative to the retracting means is not repeatable. Consequently, in some cases the stopper would prematurely bottom out so the retraction would not be triggered at all. In other cases the retraction would be triggered before the stopper bottomed so residual medicament would remain in the syringe.

The retraction could automatically be triggered a certain amount of time or travel before the stopper bottoms out in the syringe. However this reliable retraction would be traded off for residual medicament in the syringe.

Thus, in a preferred embodiment the interlock sleeve is furthermore arranged to prevent release of the distal ground of the drive spring when in its intermediate and/or distal position. This means, the drive spring remains distally grounded as long as the auto-injector is kept pressed against the injection site so the needle retraction can only start when the auto-injector is removed from the injection site and the interlock sleeve consequently returns into its proximal position and thus releases the distal ground.

A retraction sleeve may be axially movable arranged in the housing, wherein the drive spring is arranged inside the retraction sleeve with its distal end bearing against a distal end face and with its proximal end bearing against a thrust face of a decoupling member. A resilient lug on the interlock sleeve is arranged to be engaged with the retraction sleeve by the trigger button being depressed when the interlock sleeve is in its intermediate or distal position so as to prevent the retraction sleeve from translating in distal direction. Thus, when the interlock sleeve is pressed against the injection site, the retraction sleeve is kept from retracting. Only after removal of the auto-injector from the injection site and consequent translation of the interlock sleeve into its proximal position the retraction sleeve may translate in distal direction and retract the needle into the housing.

The lug may be engaged between two ramps on the trigger button in such a manner that the trigger button is pulled into the depressed position upon translation of the interlock sleeve into its proximal position by the lug sliding along the first ramp. The trigger button is pushed into its ready position by the lug sliding along the second ramp.

A third ramp may be arranged on the interlock sleeve for being engaged by a pin on the trigger button when the trigger button is being pressed when the interlock sleeve is in its intermediate position. When the trigger button is being pressed the pin slides along the third ramp and translates the interlock sleeve into its distal position for triggering the injection.

A tubular syringe carrier may be arranged for holding the syringe and supporting it at its proximal end. Supporting the syringe at the proximal end is preferred over support at the finger flanges since the finger flanges are more frangible under load while the proximal or front end of the syringe is more robust. The syringe and the syringe carrier are arranged for joint axial translation. The syringe carrier is telescoped in the interlock sleeve.

In a preferred embodiment at least one latch is provided for axially fixing the retraction sleeve in a maximum proximal position. The decoupling member is arranged to decouple the latch when being moved in proximal direction nearly into a maximum proximal position. When decoupled, the retraction sleeve is allowed to move in distal direction and retract the needle by means of the spring force which is no longer grounded at its distal end. Thus, retraction can only occur if the latches have been released and if the auto-injector has been removed from the injection site.

Preferably the plunger is arranged for pushing the syringe and/or the stopper in proximal direction. At least one but preferably two or more resilient decoupling arms are arranged at the decoupling member. The decoupling arms exhibit inner ramped surfaces bearing against a first shoulder of the plunger in proximal direction. The resilient decoupling arms are supportable by an inner wall of the retraction sleeve in order to prevent the decoupling arms from being flexed outward and slip past the first shoulder. In this state the plunger may be pushed in proximal direction by the decoupling member pushing against the first shoulder in order to insert the needle and inject the dose. At least one aperture is arranged in the retraction sleeve allowing the decoupling arms to be flexed outward by the first shoulder thus allowing the first shoulder to slip through the decoupling arms in proximal direction. This may happen when the injection is at least nearly finished. The decoupled plunger allows the syringe and needle to be retracted since it is no longer bearing against the decoupling member.

The syringe may be arranged for joint axial movement with a syringe holder which is slidably arranged in the retraction sleeve. The syringe holder is provided with at least two resilient syringe holder arms arranged distally, the syringe holder arms having a respective inclined surface for bearing against a second shoulder, which is arranged at the plunger proximally from the first shoulder. The syringe holder arms are supportable by an inner surface of the housing in order to prevent them from being flexed outward. Thus, when the trigger button is pressed the spring force forwarded by the plunger does not yet press against the stopper but against the syringe for forwarding it. Consequently, a so called wet injection is avoided, i.e. the liquid medicament is not leaking out of the hollow needle before the needle is inserted. A widened portion is provided in the housing for allowing the syringe holder arms to flex outwards when the syringe holder has nearly reached a maximum proximal position thus allowing the second shoulder to slip through the syringe holder arms and to switch load of the drive spring from the syringe to the stopper. This allows for defining the moment to start injecting the medicament.

The syringe holder may have at least one stop for being engaged by a resilient first clip on the housing in a manner to prevent translation of the syringe holder in proximal direction. The first clip may be arranged to decouple from the stop upon translation of the interlock sleeve into its distal position in order to release the drive spring and start the injection.

Usually the hollow needle is equipped with a protective needle shield for keeping the needle sterile and preventing it from being mechanically damaged. The protective needle shield is attached to the needle when the auto-injector or the syringe is assembled.

Preferably a cap is provided at the proximal end of the housing. A sheet metal clip is attached to the cap for joint axial movement and independent rotation. The sheet metal clip is arranged to extend through an orifice into the interlock sleeve when the cap is attached to the interlock sleeve. The sheet metal clip incorporates at least two barbs snapped into a circumferential notch or behind a shoulder of the protective needle shield. This allows for automatically engaging the sheet metal clip with the protective needle shield during assembly. When the cap is removed from the interlock sleeve in preparation of an injection the protective needle shield is reliably removed without exposing the user too high a risk to injure themselves.

The cap may be attachable to the housing by a screw connection. This allows for a low force removal of the protective needle shield.

The housing may have at least one viewing window for inspecting the syringe.

The auto-injector may preferably be used for subcutaneous or intra-muscular injection, particularly for delivering one of an analgetic, an anticoagulant, insulin, an insulin derivate, heparin, Lovenox, a vaccine, a growth hormone, a peptide hormone, a proteine, antibodies and complex carbohydrates.

The cap with the sheet metal spring may also be applied with other auto-injectors and injection devices.

Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus, are not limitive of the present invention, and wherein:

FIGS. 1A-B are two longitudinal sections of an auto-injector with a single drive spring for advancing a syringe with a needle, injecting a dose of medicament and retracting the syringe and needle, the auto-injector as-delivered,

FIG. 2 is a longitudinal section of the auto-injector with a skin interlock sleeve translated in distal direction and a lateral trigger button ready to be operated, and

FIG. 3 is a detail of the auto-injector with the trigger button depressed.

Corresponding parts are marked with the same reference symbols in all figures.

DETAILED DESCRIPTION

FIGS. 1A-B show two longitudinal sections in different section planes of an auto-injector1, the different section planes approximately 90° rotated to each other. The auto-injector1 comprises anelongate housing2. Asyringe3, e.g. a Hypak syringe, with ahollow needle4 is arranged in a proximal part of the auto-injector1. When the auto-injector1 or thesyringe3 is assembled a protective needle shield may be attached to the needle (not illustrated). Astopper6 is arranged for sealing thesyringe3 distally and for displacing a liquid medicament M through thehollow needle4. Thesyringe3 is held in atubular syringe carrier7 and supported at its proximal end therein. Asingle drive spring8 in the shape of a compression spring is arranged in a distal part of the auto-injector1. Aplunger9 is arranged for forwarding the spring force of thedrive spring8.

Inside the housing2 aretraction sleeve10 is slidably arranged. Before the injection is triggered theretraction sleeve10 is in a maximum proximal position and prevented from moving in distal direction D by means ofstops11 caught behind latches12 in thehousing2. A distal end of thedrive spring8 bears against anend face13 of theretraction sleeve10. Due to thestops11 and latches12 the force of thedrive spring8 is reacted into thehousing2. The proximal end of thedrive spring8 bears against adecoupling member14 arranged around theplunger9.

Thedecoupling member14 comprises athrust face17 for bearing against a proximal end of thedrive spring8. Proximally from the thrust face17 two or moreresilient decoupling arms18 are provided at thedecoupling member14, thedecoupling arms18 having inner ramped surfaces bearing against afirst shoulder19 in theplunger9 in proximal direction P. Theresilient decoupling arms18 are supported by an inner wall of theretraction sleeve10 in this situation so they cannot flex outward and slip past thefirst shoulder19.

Thesyringe carrier7 is engaged for joint axial movement with asyringe holder22 which is slidably arranged in theretraction sleeve10. Thesyringe holder22 is provided with two or more resilientsyringe holder arms23 arranged distally. Thesyringe holder arms23 have a respective inclined surface for bearing against asecond shoulder24 in theplunger9 arranged proximally from thefirst shoulder19. In the initial position shown inFIGS. 1A-B thesyringe holder arms23 are supported by an inner surface (not illustrated) of thehousing2 so they cannot flex outward and thesecond shoulder24 cannot slip through. In order to support thesyringe holder arms23 at the housing2 a respective number of apertures are provided in theretraction sleeve10.

Two resilient first clips2.1 are arranged in thehousing2 which engage stops22.1 on thesyringe holder22 so as to prevent translation of thesyringe holder22, thesyringe carrier7, thesyringe3 and theneedle4 in proximal direction P. Since thesyringe holder arms23 are kept from flexing out, the load of thedrive spring8 is statically resolved through thedecoupling member14, theplunger9 and thesyringe holder22 into the first clips2.1 in thehousing2.

Alateral trigger button20 is arranged laterally on thehousing2 with a pivot20.1 near its proximal end. In the as delivered configuration inFIGS. 1A-B thetrigger button20 is flush with thehousing2 so it cannot be depressed.

Askin interlock sleeve25 is telescoped in the proximal end P of thehousing2. Aninterlock spring26 for biasing theinterlock sleeve25 in proximal direction P is arranged between thehousing2 and theinterlock sleeve25. Thesyringe carrier7 is telescoped in a proximal portion25.1 of theinterlock sleeve25. A distal portion25.2 of theinterlock sleeve25 has a greater diameter than the proximal portion25.1. Thesyringe holder22 is telescoped in the distal portion25.2. The distal portion25.2 exhibits a lug25.3 and a third ramp25.4 for interacting with thetrigger button20. The lug25.3 is caught between two ramps20.2,20.3 arranged inwardly in thetrigger button20.

In order to start an injection the proximal end P of the auto-injector1 has to be pressed against the injection site, e.g. a patient's skin. As a result theinterlock sleeve25 translates in distal direction D into the housing2 (seeFIG. 2) until theinterlock sleeve25 is flush with the proximal end P of thehousing2. The lug25.3 also moves in distal direction D along the second ramp20.3 of thetrigger button20 thus rotating the trigger button outwardly in such a manner that thetrigger button20 laterally emerges from the housing2 (seeFIG. 2).

Thetrigger button20 has now been moved to a position where if pushed it will release thedrive spring8 in order to insert theneedle4 into the injection site and to inject the medicament M.

If the auto-injector1 is removed from the injection site without operating thetrigger button20 theinterlock sleeve25 will translate back into its proximal position under load of theinterlock spring26. The lug25.3 will slide along the first ramp20.2 and pull thetrigger button20 back into the position as inFIGS. 1A-B.

The lug25.3 is resiliently arranged in theinterlock sleeve25 in such a manner that it may be pushed radially inwards. As long as theinterlock sleeve25 is in its proximal position as inFIGS. 1A-B the lug25.3 is prevented from flexing inwards by theretraction sleeve10. When theinterlock sleeve25 is pushed into thehousing2 as inFIG. 2 the lug25.3 reaches an aperture10.1 in theretraction sleeve10 allowing it to flex inwards. If theinterlock sleeve25 is kept pressed against the injection site and thetrigger button20 is being depressed the lug25.3 will be pushed inwards through the aperture10.1. The resilience of the lug25.3 has to be chosen so as to ensure that the force required to keep theinterlock sleeve25 pressed does not exceed a convenient level for the user since the counteracting force is the sum of the spring force of theinterlock spring26 and the force created by the lug25.3 trying to slide along the second ramp20.3.

When the lug25.3 has entered the aperture10.1 theskin interlock sleeve25 is prevented from returning into its proximal position.

If thetrigger button20 was depressed with theinterlock sleeve25 only partially translated into thehousing2 the lug25.3 would not yet have reached the aperture10.1 so it could not flex inwards. Instead, depressing thetrigger button20 would force theinterlock sleeve25 back into its proximal position due to the engagement of the lug25.3 with the second ramp20.3.

When thetrigger button20 is pushed in the situation shown inFIG. 2, the lug25.3 is pushed radially inwards. A pin20.4, inwardly arranged on thetrigger button20, is pressed against the third ramp25.4 in such a manner that theinterlock sleeve25 is translated further in distal direction D into thehousing2, as shown inFIG. 3. This movement will result in a further flexing of the lug25.3, as it slides along the second ramp20.3. This position cannot be reached by just pushing theinterlock sleeve25 against the injection site. A distal end of the distal portion25.2 now reaches the clips2.1 and pushes them outwards thus decoupling thesyringe holder22 from thehousing2 and releasing thedrive spring8.

Thesecond shoulder24 pushes thesyringe holder22,syringe carrier7 andsyringe3 forward in proximal direction P while no load is exerted onto thestopper6. Thehollow needle4 appears from the proximal end P and is inserted into the injection site.

The forward movement continues until thesyringe holder22 bottoms out at afront face35 of theretraction sleeve10. The travel from the initial position up to this point defines an injection depth, i.e. needle insertion depth.

When thesyringe holder22 has nearly bottomed out, the resilientsyringe holder arms23 have reached a widened portion2.2 of thehousing2 where they are no longer supported by the inner wall of thehousing2. However, since the force required to insert theneedle4 is relatively low thesecond shoulder24 will continue to drive forward thesyringe holder22 until proximal travel is halted at thefront face35. At this point thesyringe holder arms23 are flexed out by the continued force of thesecond shoulder24 and allow it to slip through. Now theplunger9 no longer pushes against thesyringe holder22 but against thestopper6 for expelling the medicament M from thesyringe3 and injecting it into or through the patient's skin.

When thestopper6 has nearly bottomed out in thesyringe3 thedecoupling member14 has reached a position where it pushes against thelatches12 in a manner to decouple theretraction sleeve10 from thehousing2. Thus thedrive spring8 is no longer grounded with its distal end in thehousing2 by thelatches12. Instead, as soon as thedecoupling member14 has bottomed out at asecond abutment33 in thehousing2 the proximal end of thedrive spring8 gets grounded in thehousing2 while its distal end is pulling theretraction sleeve10 in distal direction D.

Just before thedecoupling member14 decouples theretraction sleeve10 from thehousing2 thedecoupling arms18 reach an aperture10.1,10.2 in theretraction sleeve10 so they are no longer kept from being flexed outward. Thedecoupling arms18 are thus pushed outward by thefirst shoulder19 pushing against its ramped surfaces so thefirst shoulder19 can slip through in distal direction D as soon as thedecoupling member14 has hit thesecond abutment33.

Although thelatches12 are disengaged now, theretraction sleeve10 may not yet slide in distal direction D because of the lug25.3 engaged in the aperture10.1 so theretraction sleeve10 is trying to pull theinterlock sleeve25 in distal direction D which is prevented by the third ramp25.4 distally abutting against thehousing2.

If the auto-injector1 is taken away from the injection site and the user releases thetrigger button20 the lug25.3 re-emerges from inside theretraction sleeve10 so theretraction sleeve10 gets disengaged from theinterlock sleeve25 and may now translate in distal direction D. A spring means may be arranged for actively pulling thetrigger button20 outwards in this situation. In an alternative embodiment the lug25.3 may project outwards with an inclination in proximal direction P so as to allow theretraction sleeve10 to push it outwards on retraction.

Thesyringe holder22 is taken along in distal direction D by theretraction sleeve10, e.g. by afront face35. Thus thesyringe3 andneedle4 are retracted into a safe position inside thehousing2, e.g. into the initial position. Theplunger9, no longer bearing against thedecoupling arms18 is pulled back, too.

Thehousing2 may have at least one viewing window for inspecting thesyringe3.

The auto-injector1 may preferably be used for subcutaneous or intra-muscular injection, particularly for delivering one of an analgetic, an anticoagulant, insulin, an insulin derivate, heparin, Lovenox, a vaccine, a growth hormone, a peptide hormone, a proteine, antibodies and complex carbohydrates.

Claims (13)

The invention claimed is:

1. An auto-injector for administering a dose of a liquid medicament, the auto-injector comprising:

an elongate housing;

an interlock sleeve configured to telescope in the elongate housing, the interlock sleeve being tubular and biased against the elongate housing to protrude from the elongate housing, the interlock sleeve configured to translate into the elongate housing against the bias;

a syringe comprising a hollow injection needle;

a drive spring;

a plunger configured to transmit a force of the drive spring to a stopper of the syringe;

a trigger button abutted against the elongate housing to prevent actuation of the auto-injector, the trigger button at least initially coupled to the interlock sleeve, wherein the trigger button is configured to emerge from the elongate housing in response to the interlock sleeve being translated into the elongate housing against the bias;

wherein the interlock sleeve is translatable in a longitudinal direction between a proximal position and a distal position and biased in a proximal direction to protrude from the elongate housing in the proximal position, wherein the interlock sleeve is arranged to be translated from the proximal position into an intermediate position when pressed against an injection site; and

a tubular syringe carrier configured to hold the syringe and to support the syringe at a proximal end of the syringe, wherein the syringe and the tubular syringe carrier are configured to axially translate jointly, wherein the tubular syringe carrier is configured to telescope in the interlock sleeve.

2. The auto-injector ofclaim 1, wherein the trigger button is pivoted in the elongate housing and configured to rotate when operated.

3. The auto-injector ofclaim 1, wherein the interlock sleeve is configured to, in the intermediate or distal position, prevent release of a distal ground of the drive spring.

4. The auto-injector ofclaim 1, further comprising a retraction sleeve slidably arranged in the elongate housing, wherein the drive spring is arranged inside the retraction sleeve, wherein a distal end of the drive spring bears against a distal end face of the retraction sleeve, wherein a proximal end of the drive spring bears against a thrust face of a decoupling member, wherein a resilient lug on the interlock sleeve is arranged to be engaged with the retraction sleeve by the trigger button being depressed when the interlock sleeve is in its intermediate or distal position so as to prevent the retraction sleeve from translating in a distal direction.

5. The auto-injector ofclaim 4, wherein the resilient lug is configured to engage between a first ramp and a second ramp on the trigger button, wherein, in response to translation of the interlock sleeve into the proximal position, the trigger button is pulled into a depressed position by the resilient lug sliding along the first ramp and the trigger button is pushed into a ready position by the resilient lug sliding along the second ramp.

6. The auto-injector ofclaim 1, wherein the interlock sleeve comprises a third ramp, wherein the trigger button comprises a pin configured to engage the third ramp in response to the trigger button being pressed with the interlock sleeve in its intermediate position, wherein the pin is configured to slide along the third ramp and translate the interlock sleeve into the distal position.

7. The auto-injector ofclaim 4, wherein the elongate housing comprises at least one latch configured to axially fix the retraction sleeve in a maximum proximal position, wherein the decoupling member is configured to decouple the at least one latch when the decoupling member is moved in a proximal direction towards a maximum proximal position, wherein, in response to the decoupling member moving in the proximal direction, the retraction sleeve is moved in a distal direction to retract the hollow injection needle.

8. The auto-injector ofclaim 4, wherein the decoupling member comprises at least two resilient decoupling arms, the at least two resilient decoupling arms having inner ramped surfaces bearing against a first shoulder of the plunger in the proximal direction, wherein the at least two resilient decoupling arms are supportable by an inner wall of the retraction sleeve to prevent the at least two resilient decoupling arms from being flexed outward and slipping past the first shoulder, wherein at least one aperture is arranged in the retraction sleeve to allow the at least two resilient decoupling arms to be flexed outward by the first shoulder to allow the first shoulder to slip through the at least two resilient decoupling arms in the proximal direction, wherein the plunger is arranged to push the syringe or the stopper in the proximal direction.

9. The auto-injector ofclaim 8, wherein the syringe is configured to move jointly with a syringe holder which is slidably arranged in the retraction sleeve, wherein the syringe holder is provided with at least two resilient syringe holder arms arranged distally, the at least two resilient syringe holder arms having a respective inclined surface for bearing against a second shoulder arranged at the plunger proximally from the first shoulder, wherein the at least two resilient syringe holder arms are supportable by an inner surface of the elongate housing in order to prevent the at least two resilient syringe holder arms from being flexed outward, and wherein the elongate housing comprises a widened portion configured to allow the at least two resilient syringe holder arms to flex outwards when the syringe holder moves towards a maximum proximal position thus allowing the second shoulder to slip through the at least two resilient syringe holder arms and to switch load of the drive spring from the syringe to the stopper.

10. The auto-injector ofclaim 9, wherein the syringe holder has at least one stop configured to be engaged by a resilient first clip on the elongate housing to prevent translation of the syringe holder in the proximal direction, wherein the resilient first clip is arranged to decouple from the stop upon translation of the interlock sleeve into the distal position.

11. The auto-injector ofclaim 1, further comprising a cap configured to attach to a proximal end of the elongate housing, wherein a sheet metal clip is attached to the cap for joint axial movement and independent rotation, the sheet metal clip arranged to extend through an orifice into the interlock sleeve when the cap is attached to the interlock sleeve, wherein the sheet metal clip incorporates at least two barbs snapped into a circumferential notch or behind a shoulder of a protective needle shield attached to the hollow injection needle.

12. The auto-injector ofclaim 11, wherein the cap is configured to attach to the interlock sleeve by a screw connection.

13. The auto-injector ofclaim 1 wherein the interlock sleeve is translatable in a longitudinal direction between a proximal position and a distal position and biased in a proximal direction to protrude from the elongate housing in the proximal position, wherein the interlock sleeve is arranged to be translated from the proximal position into an intermediate position when pressed against an injection site, and wherein movement of the trigger button causes the interlock sleeve to move from the intermediate position into the distal position thereby releasing the drive spring.

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